The correct answer is D. It is important to study the etymology of some words in a text.
Step-by-step explanation:
The word "etymology" refers to the discipline that studies the origin of words and the way they evolve during the time including the way words derive from other languages such as Greek or Latin. In texts, etymology is useful to understand key terms or concepts because by using etymology it is possible to know the way words originated and the reason why they have a certain meaning. However, as etymology studies individual each word and in most cases it is not necessary to understand the origin of a word to understand its meaning or evolution in history etymology should only be used to study some words in texts and more importantly key concepts rather than use to learn, understand or study all the words in a text. Therefore, the statement that is correct is "It is important to study the etymology of some words in a text".